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Welding process for repairing crack of ball milling iron casting

A welding process, the technology of ball-ground cast iron, which is applied in the field of welding, can solve the problems of affecting the spare parts of ball-ground cast iron and the easy formation of cold cracks, etc., and achieve the effect of simplifying the implementation process, not easy to crack, and reducing consumption

Inactive Publication Date: 2016-08-17
JINCHUAN GROUP LIMITED
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Problems solved by technology

During surfacing, homogenous welds and semi-melted areas tend to form white spots, austenite areas are more prone to martensite structure, and cold cracks are easy to form under the action of welding tensile stress, and at the same time, there is no fusion between the weld meat and the original ductile iron And delamination forms cracks, which seriously affects the service life of spare parts made of ductile cast iron and repaired

Method used

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  • Welding process for repairing crack of ball milling iron casting

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Embodiment Construction

[0015] See figure 1 , The welding process for repairing cracks of ball milled iron castings of the present invention includes:

[0016] (1) Use a plasma cutting machine to cut the beveled U-shaped welding groove along the crack, and then use an angle grinder to thoroughly polish the carburized and sulfide layer on the inner surface of the bevel groove, and then polish the bottom of the groove. Cut into a reverse arch.

[0017] (2) At the bottom of the bevel U-shaped groove, use an alloy drill to drill and tap, and embed multiple high-strength bolts (such as M14 high-strength bolts). The sum of the surface area of ​​the multiple bolts accounts for no less than the surface area of ​​the groove opening 30%. Practice has verified that the number of embedded bolts cannot exceed 30%, otherwise the weld area will become smaller, which will affect the amount of weld fusion and weld strength. The purpose of selecting planted wire welding is to root the weld meat and the base metal, enhanc...

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Abstract

A welding process for repairing cracks in ball-milled iron castings of the present invention includes: (1) cutting a beveled U-shaped welding bevel along the cracks, then carburizing and polishing the inner surface of the beveled bevel and vulcanized layer, and cleaning the bevel The bottom is then ground and ground into a reverse arch; (2) Bolts are pre-embedded at the bottom of the U-shaped welding groove on the bevel; The manual electrode arc cold welding method of high-quality weld metal; (4) The surface of the weld meat is polished and smooth. This welding process is not easy to crack after repairing the spare parts made of ductile iron, which can effectively improve the service life of the original spare parts.

Description

Technical field [0001] The invention belongs to the technical field of welding, and particularly relates to a welding process for repairing cracks in ball milled iron castings. Background technique [0002] Pyrometallurgical copper smelting cast copper anode plates usually use homemade copper molds. The casting molds used in traditional copper casting molds are made of ball milled cast iron. The full set of casting mold spare parts is 226,000 yuan / set, and the cost of the master mold bottom plate is 105,000 yuan / piece. When using anode furnace to refine 1200℃ copper liquid and casting copper mold, due to the difference in the material and structure of ball milled cast iron, in the state of rapid cooling and rapid heating, irregular cracks and burns may occur on the bottom plate, surrounding frame and upper cover of the master mold. At the same time, frequent casting of copper mold work, the effect of thermal expansion and cold contraction principles, the crystal structure of ball...

Claims

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Application Information

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IPC IPC(8): B23P6/04
CPCB23P6/04
Inventor 陶传银吕兰聚许光吝凯杨述凯董旭许登详
Owner JINCHUAN GROUP LIMITED
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